'use strict';

const fs = require('fs');
const inquirer = require('inquirer');
const fse = require('fs-extra');
const path = require('path');
const ejs = require('ejs');
const glob = require('glob');
const semver = require('semver');
const userHome = require('user-home');
const log = require('@white-cloud-cli/log');
const Command = require('@white-cloud-cli/command');
const Package = require('@white-cloud-cli/package');
const { spinnerStart, sleep, execAsync } = require('@white-cloud-cli/utils');
const getProjectTemplate = require('./getProjectTemplate');

const TYPE_PROJECT = 'project';
const TYPE_COMPONENT = 'component';

const TEMPLATE_TYPE_NORMAL = 'normal';
const TEMPLATE_TYPE_CUSTOM = 'custom';

const WHITE_COMMAND = ['npm', 'cnpm', 'yarn'];

class InitCommand extends Command {
    init() {
        this.projectName = this._argv[0] || '';
        this.force = !!this._cmd.force
        log.verbose('projectName', this.projectName)
        log.verbose('force', this.force)
    }

    exec() {
        console.log('init的业务逻辑')
    }

    async exec() {
        try{
            // 1. 准备阶段
            const projectInfo = await this.prepare();
            if (projectInfo) {
                log.verbose('projectInfo', projectInfo)
                this.projectInfo = projectInfo
            }
            // 2. 下载模板
            await this.downloadTemplate()
            // 3. 安装模板
            await this.installTemplate()
        } catch (e) {
            log.error(e.message);
            if (process.env.LOG_LEVEL === 'verbose') {
                console.log(e)
            }
        }
    }

    
    
    async installTemplate () {
        if (this.templateInfo) {
            if (!this.templateInfo.type) {
                this.templateInfo.type = TEMPLATE_TYPE_NORMAL
            }
            if (this.templateInfo.type === TEMPLATE_TYPE_NORMAL) {
                // 标准安装
                await this.installNormalTemplate()
            } else if (this.templateInfo.type === TEMPLATE_TYPE_CUSTOM) {
                // 自定义安装
                await this.installCustomTemplate()
            } else {
                throw new Error('无法识别项目模板类型！');
            }
        } else {
            throw new Error('项目模板信息不存在！');
        }
    }

    checkCommand(cmd) {
        if (WHITE_COMMAND.includes(cmd)) {
            return cmd;
        }
        return null;
    }

    async execCommand(command, errMsg) {
        let ret;
        if (command) {
            const cmdArray = command.split(' ');
            const cmd = this.checkCommand(cmdArray[0]);
            if (!cmd) {
                throw new Error('命令不存在！命令：', command);
            }
            const args = cmdArray.slice(1);
            ret = await execAsync(cmd, args, {
                stdio: 'inherit',
                cwd: process.cwd()
            })
            if (ret !== 0) {
                throw new Error(errMsg);
            }
            return ret
        }
    }

    async ejsRender(options) {
        const dir = process.cwd();
        const projectInfo = this.projectInfo
        return new Promise((resolve, reject) => {
            glob('**', {
                cwd: dir,
                ignore: options.ignore || '',
                nodir: true,
            }, (err, files) => {
                if (err) {
                    reject(err)
                }
                console.log(files)
                Promise.all(files.map(file => {
                    const filePath = path.join(dir, file);
                    return new Promise((resolve1, reject1) => {
                        ejs.renderFile(filePath, projectInfo, {}, (err, result) => {
                            if (err) {
                                reject1(err)
                            } else {
                                fse.writeFileSync(filePath, result);
                                resolve1(result)
                            }
                        })
                    })
                })).then(() => {
                    resolve()
                }).catch(err => {
                    reject(err)
                })
            })
        })
    }

    async installNormalTemplate () {
        // 拷贝模板代码到当前目录
        let spinner = spinnerStart('正在安装模板...');
        await sleep()
        try {
            const templatePath = path.resolve(this.templateNpm.cacheFilePath, 'template');
            const targetPath = process.cwd();
            fse.ensureDirSync(templatePath);
            fse.ensureDirSync(targetPath);
            fse.copySync(templatePath, targetPath);
        } catch (e) {
            throw e;
        } finally {
            spinner.stop();
            log.success('模板安装成功');
        }

        const templateIgnore = this.templateInfo.ignore || [];
        const ignore = ['**/node_modules/**', ...templateIgnore];
        await this.ejsRender({ ignore })

        const { installCommand, startCommand } = this.templateInfo;
        // 依赖安装
        await this.execCommand(installCommand, '以来安装过程中失败！')
        // 启动命令
        await this.execCommand(startCommand, '启动过程中失败！')
    }

    async installCustomTemplate () {
        // 查询自定义模板的入口文件
        if (await this.templateNpm.exists()) {
            const rootFile = this.templateNpm.gerRootFilePath();
            if (fs.existsSync(rootFile)) {
                log.notice('开始执行自定义模板');
                const templatePath = path.resolve(this.templateNpm.cacheFilePath, 'template');
                const options = {
                    templateInfo: this.templateInfo,
                    projectInfo: this.projectInfo,
                    sourcePath: templatePath,
                    targetPath: process.cwd()
                };
                const code = `require('${rootFile}')(${JSON.stringify(options)})`;
                log.verbose('code', code);
                await execAsync('node', ['-e', code], { stdio: 'inherit', cwd: process.cwd() });
                log.success('自定义模板安装成功');
            } else {
                throw new Error('自定义模板入口文件不存在！');
            }
        }
    }


    async downloadTemplate() {
        // 1. 通过项目模板API获取项目模板信息
        // 1.1 提供egg.js搭建一套后端系统
        // 1.2 通过npm存储项目模板
        // 1.3 将项目模板信息存储到mongodb数据库中
        // 1.4 通过egg.js获取mongodb中的数据并且通过API返回
        const { projectTemplate } = this.projectInfo;
        const templateInfo = this.template.find(item => item.npmName === projectTemplate);
        const targetPath = path.resolve(userHome, '.white-cloud-cli', 'template');
        const storeDir = path.resolve(userHome, '.white-cloud-cli', 'template', 'node_modules');
        const { npmName, version } = templateInfo;
        this.templateInfo = templateInfo
        const templateNpm = new Package({
            targetPath,
            storeDir,
            packageName: npmName,
            packageVersion: version
        })
        if (!(await templateNpm.exists())) {
            const spinner = spinnerStart('正在下载模板...');
            await sleep(500);
            try {
                await templateNpm.install();
            } catch(e) {
                throw e;
            } finally {
                spinner.stop(true);
                if (await templateNpm.exists()) {
                    log.success('下载模板成功！');
                    this.templateNpm = templateNpm;
                }
            }
        } else {
            const spinner = spinnerStart('正在更新模板...');
            await sleep(500);
            try {
                await templateNpm.update();
            } catch(e) {
                throw e;
            } finally {
                spinner.stop(true);
                console.log('更新模板成功！', templateNpm)
                if (await templateNpm.exists()) {
                    log.success('更新模板成功！');
                    this.templateNpm = templateNpm;
                }
            }
        }
        // console.log(templateInfo, targetPath, storeDir, npmName, version, templateNpm)
    }

    async prepare() {
        // 0. 判断项目模板是否存在
        let template = await getProjectTemplate()
        if (!template || template.length === 0) {
            throw new Error('项目模板不存在！');
        }
        this.template = template

        const localPath = process.cwd();
        // 1. 判断当前目录是否为空
        if (!this.isDirEmpty(localPath)) {
            let ifContinue = false;
            if (!this.force) {
                // 询问是否继续创建
                ifContinue = (await inquirer.prompt({
                    type: 'confirm',
                    name: 'ifContinue',
                    default: false,
                    message: '当前文件夹不为空，是否继续创建项目？'
                })).ifContinue;
                if (!ifContinue) {
                    return;
                }
            }
            // 2. 是否启动强制更新
            if (ifContinue || this.force) {
                // 给用户做二次确认
                const { confirmDelete } = await inquirer.prompt({
                    type: 'confirm',
                    name: 'confirmDelete',
                    default: false,
                    message: '是否确认清空当前目录下的文件？'
                })
                if (confirmDelete) {
                    // 清空当前目录
                    fse.emptyDirSync(localPath);
                }
            }
        }
        return this.getProjectInfo()
    }

    isValidName(v) {
        return /^[a-zA-Z]+([-][a-zA-Z][a-zA-Z0-9]*|[_][a-zA-Z][a-zA-Z0-9]*|[a-zA-Z0-9])*$/.test(v);
    }

    async getProjectInfo() {
        let projectInfo = {};
        let isProjectNameValid = false;
        if (this.isValidName(this.projectName)) {
            isProjectNameValid = true;
            projectInfo.projectName = this.projectName;
        }

        // 1. 选择创建项目或组件
        const { type } = await inquirer.prompt({
            type: 'list',
            name: 'type',
            message: '请选择初始化类型',
            default: TYPE_PROJECT,
            choices: [{
                name: '项目',
                value: TYPE_PROJECT
            }, {
                name: '组件',
                value: TYPE_COMPONENT
            }]
        });
        log.verbose('type', type);
        this.template = this.template.filter(template => template.tag.includes(type));
        const title = type === TYPE_PROJECT ? '项目' : '组件';

        const projectNamePrompt = {
            type: 'input',
            name: 'projectName',
            message: `请输入${title}名称`,
            default: '',
            validate: function(v) {
                const done = this.async();

                setTimeout(function() {
                    // 输入的首字符必须为英文字符
                    // 尾字符必须为英文或数字，不能为字符
                    // 字符仅仅允许 -_
                    if (!this.isValidName(v)) {
                        done(`请输入合法的${title}名称`);
                        return
                    }
                    done('', true);
                }, 0)
            },
            filter: function(v) {
                return v;
            },
        }
        const projectPrompt = [];
        if (!isProjectNameValid) {
            projectPrompt.push(projectNamePrompt);
        }
        projectPrompt.push({
            type: 'input',
            name: 'projectVersion',
            message: `请输入${title}版本号`,
            default: '1.0.0',
            validate: function(v) {
                const done = this.async();

                setTimeout(function() {
                    // 输入的首字符必须为英文字符
                    // 尾字符必须为英文或数字，不能为字符
                    // 字符仅仅允许 -_
                    if (!(!!semver.valid(v))) {
                        done('请输入合法的版本号');
                        return
                    }
                    done('', true);
                }, 0)
            },
            filter: function(v) {
                if(!!semver.valid(v)) {
                    return semver.valid(v);
                }
                return v;
            }
        }, 
        {
            type: 'list',
            name: 'projectTemplate',
            message: `请选择${title}模板`,
            choices: this.createTemplateChoice()
        })

        if (type === TYPE_PROJECT) {
            // 2. 获取项目的基本信息
            const project = await inquirer.prompt(projectPrompt);
            projectInfo = {
                ...projectInfo,
                type,
                ...project
            }
        } else if (type === TYPE_COMPONENT) {
            const descriptionPrompt = {
                type: 'input',
                name: 'componentDescription',
                message: '请输入组件描述信息',
                default: '1.0.0',
                validate: function(v) {
                    const done = this.async();
    
                    setTimeout(function() {
                        // 输入的首字符必须为英文字符
                        // 尾字符必须为英文或数字，不能为字符
                        // 字符仅仅允许 -_
                        if (!v) {
                            done('请输入组件描述信息');
                            return
                        }
                        done('', true);
                    }, 0)
                }
            }
            projectPrompt.push(descriptionPrompt);
            // 2. 获取组件的基本信息
            const component = await inquirer.prompt(projectPrompt);
            projectInfo = {
                ...projectInfo,
                type,
                ...component
            }
        }

        // 生成classnames
        if (projectInfo.projectName) {
            projectInfo.name = projectInfo.projectName;
            projectInfo.className = require('kebab-case')(projectInfo.projectName).replace(/^-/, '');
        }
        if (projectInfo.projectVersion) {
            projectInfo.version = projectInfo.projectVersion;
        }
        if (projectInfo.componentDescription) {
            projectInfo.description = projectInfo.componentDescription;
        }
        // return 项目的基本信息（object)
        return projectInfo
    }

    isDirEmpty(localPath) {
        let fileList = fs.readdirSync(localPath);
        // 文件过滤逻辑
        fileList = fileList.filter(file => (
            !file.startsWith('.') && ['node_modules'].indexOf(file) < 0
        ));
        return !fileList || fileList.length <= 0;
    }

    createTemplateChoice() {
        return this.template.map(item => ({
            name: item.name,
            value: item.npmName
        }))
    }
}

function init(argv) {
    // console.log('init', projectName, cmdObj.force, process.env.CLI_TARGET_PATH)
    return new InitCommand(argv)
}


module.exports = init;
module.exports.InitCommand = InitCommand;